Head for well-casings.



Patented June 29, 1915.

H W w a a J a W G W 6 P// 44A f 3 4 m 3 T Z 2 z M/mxm' WILSON B. WIGLE, OF FULLERTON, CALIFORNIA, ASSIGNOB OF ONE-:HALF TO REGAN' OIL TOOL COMFANY, F SHERMAN, CALIFORNIA, A CORPORATION OF CALIFORNIA.

HEAD FOR WELL-CASINGS.

Lid-626.

Application filed May 5, 1914. Serial No. 836,537.

To all-whom it may concern Be it known that 1, WILSON B. WIGLE, a citizen of the Dominion of Canada, residing at Fullerton, in the county of Orange, State of California, have'invented new and useful Improvements in Heads for VVell-Casings, of which the following is a specification.

This invention relates to a head for well casings.

It is the object of this invention to providea head for closing the upper ends of well casings, which is particularly adapted for use in oil well drilling operations, and which is so constructed as to engage and support the pump tubing when the casing is closed by the head, and which may be employed in supporting the pump tubing when connecting or disengaging tube sections above the well casing in raising or lowering the pump tubing.

A further object is to provide a casing head in which. the use of packing glands, casing clamps, anchor clamps,.bolts and the like are dispensed with, and which will effectively eliminate any danger of a blow-out.

A further object is to provide a casing head having a main body member adapted to be removably connected to the upper end ofthewell casing and having a detachable seat for removable tubing engaging slips, which will permit of the well tubing being raised or-lowered without removing the easing head, and which head further includes a detachable cap forsealing the main portion of the casing head and adapted to be connected to the pump tubing. to form a tight non-leakable joint therewith and at the same time form an anchor for the pump tubing.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a vertical section of a casing head constructed in accordance with this invention. Fig. 2 is a horizontal section on the line 22 of Fig. 1. Fig. 3 is a side elevation showing the exterior of the casing head.

More specifically, 5 indicates a well casing, the upper end of which is externally threaded as indicated at 6, to receive the cylindrical body portion 7 of the casing head, which has a longitudinal bore 8 extending therethrough internally threaded at its lower end .to connect with the casing 5 and internally threaded at its. upper end to receive an externally threaded ring 9. The

bore 8 is of a diameter approximately equal that of the interior diameter of the well casing 5 so as to permit the ready introduction of swabbing tools for cleaning the well casng when the ring 9 is removed. The ring 9 .15 formed with a central circular opening, the wall of which converges downwardly to form a seat 10 for a series of tapered slips 11, here shown as three in number, and which slips are formed with curved inner faces adapted to conform to the outer periphery of a pump tube 12; the curved faces of the slips 11 being formed with upwardly extending teeth or serrations 13 for positive engagement with the outer surface of the pipe tubing.

The ring 9 is formed with an annular flange 14: on its uper edge which seats on a shoulder 15 formed on the body portion 7 of the casing head when the ring 9 is tightly crowded in place so that the load carried by the ring 9-will be transmitted to the body portion of the casing head 7 through the flange 14: so as to relieve the threaded connections between the ring 9 and the casing head of stripping strings. The ring 9 is provided with diametrically opposed sockets 16 for the reception of a spanner 'wrench by means of which it may be readily inserted in the casing head and removed therefrom.

The'upper end of the body portion 7 of the casing head is reduced in diameter to form an annular shoulder 17 thereon and the reduced portion is externally threaded to. receive an internally threaded flange 18 formed on a cap 19 having an upwardly extendmg internally threaded tubular portion 20. The cap 19 is provided for the purpose of sealing the body member 7 of the casing head and at the same time form an anchorage and support for the pump tube 12 to which it is detachably connected in such manner as to form a tight joint between the cap and the pump tube. This connection is here shown as consisting of a nipple 21 whlch is internally threaded at its lower end to receive the externally threaded upper end of the pump tube 12 and internally threaded at its upper end to ,receive a conduit 22 leading to the intake of a pump or other point. The nipple 21 is formed with a differential external diameter, the upper portion of which is smooth and the lower portion of which is threaded to receive the Patented June 29, row.

internally threaded'portion 20 of the cap 19.

The body member 7 of the casing head is provided with internally threadedapertures 23 in its side walls to receive the ends of overflow pipes 24 leading to any suitable point of discharge and which pipes provide egress for accumulations of gas in the Well casing or the overflow of oil as is common in casing head construction.

In the application of the invention the body portion 7 of the casing head is screwed on the upper end of the well casing and the ring 9 is positioned therein in readiness to receive the slips 11; these slips being placed in position when it is desired to engage and support a section of the pump tubing 12 when adding another section thereto or detaching it therefrom; the sleeves 11 being removedwhen it is desired to raise or lower the pump tubing. When the pump tubing sections 12 are placed in the desired position in the well casing the nipple 21 is screwed on the upper end of the upper section of the well tubing whereupon the cap 19 is placed over the upper end of the nipple 21, as indicated in dotted lines in Fig. 1, and screwed downwardly thereon; the threads on the flange engaging the external threads on the upper end of the body member 7 the cap 19 being screwed on the latter until the lower edge of the flange 18 abuts againstthe shoulder 17. A nipple 21"is set on'the pump tube 12 in such position that when the cap 19 is screwed on the body portion 7 the connection between the nipple and the cap will be of such length as to insure a tight joint at this point. When the parts are thus assembled the top of the well casing 5 is ef- 'fectively capped; the construction here shown and described obviating the use of packing glands, clamps and similar devices at the same time permitting of a ready removal of the cap to casing when desired.

What I claim is:

1. A casing head, comprising a cylindrical tubular member threaded to receive the upper end of a well casing and having its upper end portion threaded internally and externally, a ring formed with a tapered slip seat threaded externally to engage the internal threads of the casing'head, a plurality of pump tube engaging slips formed to be supported on the tapered seat on said ring, a vcap internally threaded to engage the exteriorly threaded-portion of the casing head member, and means for connecting said cap'to the well casing.

give access to the well 2. Acasing head, comprising a cylindrical tubular member threaded to receive the upper end of a well casing and having its upper end portionthreaded internally and externally, a ring formed with a tapered slip seat threaded externally to engage the internal threads of the casing head, a plurality of pump tube engaging slips formed to be supported, on the tapered seat on said ring, a cap internally threaded to'engage the exteriorly threaded portion of the casmg head member and having an internally threaded aperture, means for connecting said cap to the well casing, comprising a nipple internally threaded to receive the correspondingly threaded upper end of a pump tube and externally threaded to be engaged by the internally threaded aperture in the cap.

In witness that I claim the foregoing I have hereunto subscribed my name this 18th day of April, 1914.

i W. B. WIGLE. Witnemes:

lylmzcumrrrn BATES, MARIE BATTEY. 

